Just to let you know that my large websearch has turned uo nothing of that name or at that location. But then there are over 85 in County Mayo, The closest Megalithomania shows being at G183 & G184
I have the Mayo Megalithic Tomb Survey at home. I'll look up the entry and post a misc note for it tonight and email you with the full content.
I think the Mayo one has photos of all sites in the back, so I should be able to verify that you actually found it or not. Sometimes the descriptions aren't all that clear.